On 6/4/2021 1:25 PM, Ajith R wrote:

Hi,

...

In order answer that you have to make a MWE that we can run without the need to edit a file.

...

Hans

Sorry for having assumed that sharing the code was sufficient as MWE.

Here is the trimmed version that still throws the error

\startMPpage StartPage ;

numeric row, col, unit; pair  middle; row := 1; col := 1; unit := 2 * cm ; picture p, q ; p := nullpicture; q := nullpicture; string l[]; l[0] := "2" ; l[1] := " 4";

for i= 0 upto row : middle := (i * unit, 5cm); p := thelabel( l[i], middle); draw p; %q := p reflectedabout (0.5[urcorner p, ulcorner p], 0.5[lrcorner p, llcorner p]); %draw q

here a ; is missing after the q

endfor StopPage ; \stopMPpage \stoptext

The file is also attached.  As I told earlier, an  error is thrown if I uncomment the line that assigns q and then draws it.

Thanks for your help, ajith

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On 6/4/2021 5:08 PM, Ajith R wrote:

Hi,

...

here a ; is missing after the q

That was a silly mistake while making the MWE. When I corrected it, the MWE compiled correctly. However, the original code didn't have that error and wouldn't compile. So, I tried another MWE and found out what was causing the error. In the array I defined, there were two elements with empty string as their value. Once I changed those empty strings to some valid string, there was no error and the file compiled as expected. Here is the new MWE with one array element defined as empty string

\starttext \switchtobodyfont[30pt] \startMPpage StartPage ; unit := 2 * cm ; %numeric lm, row, col, bm; pair  middle; row := 1; col := 1; picture p, q ; p := nullpicture; q := nullpicture;

string l[], lbl; l[0] := "" ; l[1]:= "2";

for i= 0 upto row: middle := 0.5[((( i * unit) ), ((2 * unit))), ((((i+1) * unit) ), ((2 * unit) ))]; lbl := l[i]; p := thelabel(lbl, middle); q := p reflectedabout (0.5[urcorner p, ulcorner p], 0.5[lrcorner p, llcorner p]); draw q;

endfor StopPage ; \stopMPpage \stoptext

This will throw an error. If l[0] is defined as, say, "hi", there is no error

I suppose, my work around would be to use a non empty string and then fill that cell dark. Is there another way?

Anyway, thanks for your prompt replies and patience.

Thanks a ton for sharing your efforts with the world you canot reflect about zero dimensions:

p := thetextext(lbl, middle); message(0.5[urcorner p, ulcorner p]); if llcorner p <> urcorner p : q := p reflectedabout (0.5[urcorner p, ulcorner p], 0.5[lrcorner p, llcorner p]); draw q; fi ----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl -----------------------------------------------------------------